require 'abstract_unit'

class DispatcherTest < Test::Unit::TestCase
  Dispatcher = ActionController::Dispatcher
  Reloader   = ActionController::Reloader

  def setup
    ENV['REQUEST_METHOD'] = 'GET'
    reset_dispatcher
    Dispatcher.stubs(:require_dependency)
  end

  def teardown
    ENV.delete 'REQUEST_METHOD'
    reset_dispatcher
  end

  def test_clears_dependencies_after_dispatch_if_in_loading_mode
    ActiveSupport::Dependencies.expects(:clear).once
    # Close the response so dependencies kicks in
    dispatch(false).last.close
  end

  def test_reloads_routes_before_dispatch_if_in_loading_mode
    ActionController::Routing::Routes.expects(:reload).once
    dispatch(false)
  end

  def test_leaves_dependencies_after_dispatch_if_not_in_loading_mode
    ActionController::Routing::Routes.expects(:reload).never
    ActiveSupport::Dependencies.expects(:clear).never

    dispatch
  end

  def test_builds_middleware_stack_only_during_initialization_if_not_in_loading_mode
    dispatcher = create_dispatcher
    assert_not_nil dispatcher.instance_variable_get(:"@app")
    dispatcher.instance_variable_set(:"@app", lambda { |env| })
    dispatcher.expects(:build_middleware_stack).never
    dispatcher.call(nil)
    dispatcher.call(nil)
  end

  def test_rebuilds_middleware_stack_on_every_request_if_in_loading_mode
    dispatcher = create_dispatcher(false)
    dispatcher.instance_variable_set(:"@app", lambda { |env| })
    dispatcher.expects(:build_middleware_stack).twice
    dispatcher.call(nil)
    Reloader.default_lock.unlock
    dispatcher.call(nil)
  end

  def test_doesnt_wrap_call_in_reloader_if_not_in_loading_mode
    Reloader.expects(:run).never
    dispatch
  end

  def test_wraps_call_in_reloader_if_in_loading_mode
    Reloader.expects(:run).once
    dispatch(false)
  end

  # Stub out dispatch error logger
  class << Dispatcher
    def log_failsafe_exception(status, exception); end
  end

  def test_failsafe_response
    Dispatcher.any_instance.expects(:dispatch).raises('b00m')
    ActionController::Failsafe.any_instance.expects(:log_failsafe_exception)

    response = nil
    assert_nothing_raised do
      response = dispatch
    end
    assert_equal 3, response.size
    assert_equal 500, response[0]
    assert_equal({"Content-Type" => "text/html"}, response[1])
    assert_match /500 Internal Server Error/, response[2].join
  end

  def test_prepare_callbacks
    a = b = c = nil
    Dispatcher.to_prepare { |*args| a = b = c = 1 }
    Dispatcher.to_prepare { |*args| b = c = 2 }
    Dispatcher.to_prepare { |*args| c = 3 }

    # Ensure to_prepare callbacks are not run when defined
    assert_nil a || b || c

    # Run callbacks
    Dispatcher.run_prepare_callbacks

    assert_equal 1, a
    assert_equal 2, b
    assert_equal 3, c

    # Make sure they are only run once
    a = b = c = nil
    dispatch
    assert_nil a || b || c
  end

  def test_to_prepare_with_identifier_replaces
    a = b = nil
    Dispatcher.to_prepare(:unique_id) { |*args| a = b = 1 }
    Dispatcher.to_prepare(:unique_id) { |*args| a = 2 }

    Dispatcher.run_prepare_callbacks
    assert_equal 2, a
    assert_equal nil, b
  end

  private
    def dispatch(cache_classes = true)
      ActionController::Routing::RouteSet.any_instance.stubs(:call).returns([200, {}, 'response'])
      Dispatcher.define_dispatcher_callbacks(cache_classes)
      Dispatcher.new.call({'rack.input' => StringIO.new('')})
    end

    def create_dispatcher(cache_classes = true)
      Dispatcher.define_dispatcher_callbacks(cache_classes)
      Dispatcher.new
    end

    def reset_dispatcher
      Dispatcher.middleware = ActionController::MiddlewareStack.new do |middleware|
        middlewares = File.expand_path(File.join(File.dirname(__FILE__), "../../lib/action_controller/middlewares.rb"))
        middleware.instance_eval(File.read(middlewares))
      end

      # Clear callbacks as they are redefined by Dispatcher#define_dispatcher_callbacks
      Dispatcher.instance_variable_set("@prepare_dispatch_callbacks", ActiveSupport::Callbacks::CallbackChain.new)
      Dispatcher.instance_variable_set("@before_dispatch_callbacks", ActiveSupport::Callbacks::CallbackChain.new)
      Dispatcher.instance_variable_set("@after_dispatch_callbacks", ActiveSupport::Callbacks::CallbackChain.new)

      Dispatcher.define_dispatcher_callbacks(true)
    end

    def assert_subclasses(howmany, klass, message = klass.subclasses.inspect)
      assert_equal howmany, klass.subclasses.size, message
    end
end